#
# peerscape.discovery.lookup
#
# Copyright 2007-2009 Helsinki Institute for Information Technology
# and the authors.
#
# Authors: Toni Ruottu <toni.ruottu@iki.fi>
#          Ken Rimey <rimey@hiit.fi>
#

# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

from __future__ import with_statement
from contextlib import contextmanager

import socket
from hashlib import sha1

from openlookup.client.multivalued import Proxy, Error
from peerscape.version import VERSION

class SocketError(Error): pass

application = 'Peerscape %s' % VERSION
proxy = Proxy(app=application)

def put(key, value, ttl, secret=None):
    key = sha1(key).digest()
    with reraise_exception():
        proxy.put(key, value, secret=secret, ttl=ttl)

def rm(key, value, secret, ttl=7*24*3600):
    key = sha1(key).digest()
    with reraise_exception():
        proxy.rm(key, value, secret, ttl=ttl)

def get(key, maxvals=2**31-1):
    key = sha1(key).digest()
    with reraise_exception():
        values, placemark = proxy.get(key, maxvals)
        return values

@contextmanager
def reraise_exception():
    try:
        yield
    except socket.timeout:
        raise SocketError('Timeout connecting to OpenLookup.')
    except socket.error:
        raise SocketError('Failed to connect to OpenLookup.')
